| Issue |
A&A
Volume 367, Number 1, February III 2001
|
|
|---|---|---|
| Page(s) | 273 - 276 | |
| Section | Interstellar and circumstellar matter | |
| DOI | https://doi.org/10.1051/0004-6361:20000530 | |
| Published online | 15 February 2001 | |
Research Note IY Ursae Majoris: Accretion disc evolution after superoutburst
1
Institute of Astronomy, Bulgarian Academy of Sciences, 72 Tsarighradsko Shousse Blvd., 1784 Sofia, Bulgaria
2
Royal Observatory of Belgium, Avenue Circulaire 3, 1180 Brussels, Belgium
Z. Kraicheva
Received:
27
July
2000
Accepted:
15
December
2000
CCD photometry of the newly discovered eclipsing dwarf nova
IY Ursae Majoris is used to study the physical properties of
the accretion disc in the late
decline and quiescence stages. Eclipse mapping analysis shows that in
these stages the accretion disc is cool
with approximately flat radial brightness temperature distribution
and 
K. The hot spot is found to lie close along
the stream trajectory at distance 
and 
from the
disc center in February and March.
The orbital hump strength
decreases by ∼30% in a month. Taking the smallest possible
size of the hot spot, we derive an upper limit for its brightness
temperature, ∼15 900 K and ∼13 800 K, respectively.
Key words: accretion, accretion disc / binaries: eclipsing / stars: individual: IY UMa / dwarf nova, cataclysmic variables
© ESO, 2001
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